markusbk

Duplicate of https://news.ycombinator.com/item?id=20992991.

Repost of https://news.ycombinator.com/item?id=10833278.

Steve Yegge, high profile developer previously at Google and Amazon, now head of engineering for Data Insights at Grab, wrote a nice blog post about why he quit his job at Google to join Grab:

https://medium.com/@steve.yegge/why-i-left-google-to-join-gr...

Seems AWS has added T3 RDS instances for MySQL in Stockholm now. Not for PostgreSQL yet, though.

One useful takeaway:

> When Clean Code becomes a source of less boring work, I’m for it. When it becomes a source of frustration and guilt, I’m against it.

Some useful background info in https://www.kartar.net/2017/10/prometheus/ on why Turnbull wrote the book, despite being one of the maintainers for a competing monitoring tool, Riemann.

If your input is already sorted (like this article assumes), you can use "sort -m", which is a lot faster. Also, to print only lines with duplicates, use "uniq -d" instead of "uniq -c | grep 2\ ".

Union: Instead of

    cat a_list b_list | sort | uniq

do

    sort -m a_list b_list | uniq

Intersection: Instead of

    cat a_list b_list | sort | uniq -c | grep 2\ 

do

    sort -m a_list b_list | uniq -d

Relative complement: Instead of

    cat a_list b_list b_list | sort | uniq -c | grep 2\ 

do

    sort -m a_list a_list b_list | uniq -u

Note the change of approach here: instead of making lines from b_list appear twice and grepping for that count, make lines from a_list appear twice and have uniq only print lines that aren't repeated.